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ReferenceA plain-language reference to the cooling and ventilation equipment actually installed across the UAE — what each type is, where you'll find it, what tends to go wrong, and what servicing involves.
Systems where refrigerant cools indoor air directly through an evaporator coil.
An exposed indoor unit bolted to the underside of a concrete slab, used where there is no false ceiling to conceal equipment.
An all-in-one heavy-duty DX system sited on a roof or slab, connected straight into a building's main ductwork.
Covered in detail elsewhere on the site:
Plant that chills water to roughly 4-7°C and pipes it through a building.
A chiller that rejects heat straight to ambient air through condenser fans, with no cooling tower or water loop.
A chiller that rejects heat into a condenser water loop served by cooling towers, rather than directly to the air.
A very high capacity chiller using a centrifugal compressor, typically for loads above 1,000 tons of refrigeration.
A chiller driven by a heat source such as waste steam, hot water or solar thermal energy instead of an electric compressor.
Cooling bought as a metered utility from a central district plant.
A centralised industrial plant producing chilled water for an entire district, delivered to buildings as a metered utility.
The building's mechanical interface with a district cooling network, where plate heat exchangers transfer cooling from the district loop to the building's internal loop.
The equipment that moves and conditions air inside a building loop.
Covered in detail elsewhere on the site:
Purpose-built systems for data centres, hazardous areas and temporary structures.
A weatherproof packaged cooling unit mounted on a frame or trailer, ducted into temporary structures via flexible canvas ducting.
Computer Room Air Conditioning: a DX or chilled-water system engineered for tight temperature and humidity control, running continuously.
HVAC built with spark-resistant components and certified enclosures for hazardous-area classified zones.
Extract, filtration and life-safety ventilation equipment.
A high-efficiency filtration unit using electrostatic precipitators and carbon filters to clean commercial kitchen exhaust before it is released outside.
A thermal wheel inside a fresh air unit that captures cooling from outgoing exhaust air to pre-cool incoming outdoor air.
High-temperature exhaust fans, stairwell pressurisation fans and smoke curtains engineered to control smoke movement during a fire.
Covered in detail elsewhere on the site:
Reheat, hot water and process heating plant.
Resistance heating coils fitted inside ductwork or an AHU to provide reheat, mild space heating or humidity control.
An industrial hot water vessel serving domestic hot water to an entire hotel or residential tower.
Covered in detail elsewhere on the site:
The control layer governing how everything above actually runs.
A centralised control network, typically using BACnet or Modbus, that monitors and controls chillers, AHUs, FAHUs, VAVs and energy meters across a building.
A duct-mounted damper assembly that modulates the volume of conditioned air delivered to a zone based on thermostat demand.
What the monitors measure, what Dubai Municipality actually requires, and where the numbers circulating online are wrong. Sourced from DM-HSD-GU119-IAQ Version 3, July 2024.
The six parameters Dubai Municipality assesses, each with its actual limit and table reference. Several figures repeated across UAE websites are wrong.
Desert dust, what each particle size does inside the body, and the DM limits of 35 µg/m³ for PM2.5 and 150 µg/m³ for PM10 over 24 hours.
The DM limit is 800 ppm over 8 hours, not the 1000 ppm quoted almost everywhere. What a failing reading actually means.
300 µg/m³ for new buildings, 0.6 mg/m³ for existing ones, and the Table 4 provision that can rescue a failed handover.
0.01 ppm over 8 hours, not the 0.08 ppm everyone cites. The most common reason a new fit-out fails a pre-occupancy test.
22.5 to 25.5 °C and 20 to 60% RH. Why over-cooling makes condensation worse rather than better.
What a monitor reading proves, what it does not, and the alarm thresholds worth setting.
Tell us what you need and we confirm a fixed written price after inspection. No charge to quote.
Last updated:
HILLS AC Services, Business Park Building 4, 7th Floor, Hadaeq Sheikh Mohammed Bin Rashid, Dubai Hills, Dubai, UAE. Contact: info@hillsacservices.com · +971 58 563 0095.
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HILLS AC Services enters people's homes and offices. We treat what we see and record there as confidential, and we handle your personal data in line with UAE Federal Decree-Law No. 45 of 2021 (the UAE Personal Data Protection Law).
We process your data on the basis of your consent (when you contact us) and to perform the contract for the service you have booked.
We ask for the minimum needed to quote and deliver the job: name, contact number, area, and address at booking. We do not ask for identification documents, financial details or anything unrelated to the service.
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Prices shown on this website are starting prices. Your final price is fixed in writing after the inspection and does not change on the day, unless you ask us to add work that was not quoted.
Bookings are confirmed by WhatsApp or email. Please give us at least 12 hours' notice to cancel or reschedule so we can reallocate the slot.
Someone over 18 must be present to give access at the start and to sign off at the end. Please make sure ceiling access panels and tank hatches are reachable.
If you are not satisfied with a duct or deep cleaning job, tell us within 7 days and we will return and re-clean the affected area at no charge.
We are insured. We protect floors and furniture before starting. In the unlikely event we damage something, report it within 48 hours and we will repair, replace or compensate fairly. We are not liable for pre-existing faults in ageing AC equipment, ductwork or plumbing that become apparent during service. We will always point these out to you.
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